Menstrual refers to the monthly cycle in women which prepares the female for ovulation, generally once per month, which is that time of month that the egg can be fertilized by the male sperm, for the purpose of reproduction. Menstrual cycles start at the first day of menstruation. (it's always been curious to me that 'menstrual' and 'menopause' start with 'men...'-:).
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Color varies:
The color of menstrual blood varies and is not usually something we pay a lot of attention to. If your period is coming at the usual time this this is likely your period. If you are also having discharge or signs of infection then see your doctor for testing.
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Color of blood:
The color of the blood from a menstrual cycle has to do with its components. A cycle is the lining of the uterus sloughing off because it is not being used to house an embryo (combination of an egg and sperm). Every month your body prepares itself to be pregnant and when it is not the uterus expels the unused material, which is your period.
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NOT Pregnant:
If menstruating, you would not be pregnant, and the color of the blood flow has nothing to do with being pregnant. I suspect as the flow becomes more scant, it may look different in color to you.
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Up to 6 weeks:
You will be bleeding for a while although it should be gradually decreasing. If you try to do too much and get overtired in particular you may notice increased bleeding, in which case you simply need to get more rest. If it still seems excessive to you then see your doctor.
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It can be:
Color ranges go from brown, maroon, to bright fluorescent red/hot pink, light pink, blood red (hence the name!) the more oxygenated it is, the brighter red it is. Even on the last day of your period. Can be heavy too, although normally it's not. Some people have short heavy periods, others have heavy, then light. So, it's quite individual in reality.
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